Solving Universal Gravity Questions: Speed of Earth, Pallas' Orbit

[hoooossein]

hey i have 2 very simple questions i can't seem to do.

1) determine the speed of the Earth around the sun...

2)The asteroid Pallas has an orbital period of 4.62 years. find the semi-major axis of its orbit.


i no these r simple but i just can't seem to get them can someone help me or let me know of some formulas that will help? thank you in advance

 

[hage567]

Look up Kepler's laws in your book.